File lightdm-xauthlocalhostname-support.patch of Package lightdm

Set XAUTHLOCALHOSTNAME to the hostname for local logins to avoid issues in the session in case the hostname changes

diff --git a/src/Makefile.am b/src/Makefile.am
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -74,7 +74,9 @@ lightdm_SOURCES = \
 	xdmcp-session.h \
 	xdmcp-session-private.h \
 	opensuse-sysconfig.c \
-	opensuse-sysconfig.h
+	opensuse-sysconfig.h \
+	util.c \
+	util.h
 
 lightdm_CFLAGS = \
 	$(LIGHTDM_CFLAGS) \
diff --git a/src/seat-xlocal.c b/src/seat-xlocal.c
--- a/src/seat-xlocal.c
+++ b/src/seat-xlocal.c
@@ -16,6 +16,7 @@
 #include "x-server-local.h"
 #include "plymouth.h"
 #include "vt.h"
+#include "util.h"
 
 G_DEFINE_TYPE (SeatXLocal, seat_xlocal, SEAT_TYPE);
 
@@ -235,12 +236,16 @@ static void
 seat_xlocal_run_script (Seat *seat, DisplayServer *display_server, Process *script)
 {
     const gchar *path;
+    gchar *hostname;
     XServerLocal *x_server;
 
     x_server = X_SERVER_LOCAL (display_server);
     path = x_server_local_get_authority_file_path (x_server);
     process_set_env (script, "DISPLAY", x_server_get_address (X_SERVER (x_server)));
     process_set_env (script, "XAUTHORITY", path);
+    hostname = lightdm_gethostname ();
+    process_set_env (script, "XAUTHLOCALHOSTNAME", hostname);
+    g_free (hostname);
 
     SEAT_CLASS (seat_xlocal_parent_class)->run_script (seat, display_server, script);
 }
diff --git a/src/util.c b/src/util.c
new file mode 100644
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,15 @@
+#include <unistd.h>
+#include <limits.h>
+#include <glib.h>
+#include "util.h"
+
+gchar *
+lightdm_gethostname (void)
+{
+    gchar hostname[HOST_NAME_MAX + 1];
+
+    if (gethostname (hostname, HOST_NAME_MAX) == 0)
+        return g_strdup (hostname);
+
+    return g_strdup ("localhost");
+}
diff --git a/src/util.h b/src/util.h
new file mode 100644
--- /dev/null
+++ b/src/util.h
@@ -0,0 +1,3 @@
+#include <glib.h>
+
+gchar * lightdm_gethostname (void);
diff --git a/src/x-server-local.c b/src/x-server-local.c
--- a/src/x-server-local.c
+++ b/src/x-server-local.c
@@ -22,6 +22,7 @@
 #include "configuration.h"
 #include "process.h"
 #include "vt.h"
+#include "util.h"
 
 struct XServerLocalPrivate
 {
@@ -152,13 +153,14 @@ XServerLocal *
 x_server_local_new (void)
 {
     XServerLocal *self = g_object_new (X_SERVER_LOCAL_TYPE, NULL);
-    gchar hostname[1024], *number, *name;
+    gchar *hostname, *number, *name;
 
     x_server_set_display_number (X_SERVER (self), x_server_local_get_unused_display_number ());
 
-    gethostname (hostname, 1024);
+    hostname = lightdm_gethostname ();
     number = g_strdup_printf ("%d", x_server_get_display_number (X_SERVER (self)));
     x_server_set_authority (X_SERVER (self), x_authority_new_cookie (XAUTH_FAMILY_LOCAL, (guint8*) hostname, strlen (hostname), number));
+    g_free (hostname);
     g_free (number);
 
     name = g_strdup_printf ("x-%d", x_server_get_display_number (X_SERVER (self)));
diff --git a/src/x-server.c b/src/x-server.c
--- a/src/x-server.c
+++ b/src/x-server.c
@@ -15,6 +15,8 @@
 
 #include "x-server.h"
 #include "configuration.h"
+#include "x-server-local.h"
+#include "util.h"
 
 struct XServerPrivate
 {  
@@ -168,6 +170,12 @@ x_server_connect_session (DisplayServer 
     else
         l_debug (session, "Not setting XDG_VTNR");
 
+    if (IS_X_SERVER_LOCAL (display_server))
+    {
+        gchar *hostname = lightdm_gethostname ();
+        session_set_env (session, "XAUTHLOCALHOSTNAME", hostname);
+        g_free (hostname);
+    }
     session_set_env (session, "DISPLAY", x_server_get_address (X_SERVER (display_server)));
     session_set_xdisplay (session, x_server_get_address (X_SERVER (display_server)));
     session_set_remote_host_name (session, x_server_get_hostname (X_SERVER (display_server)));